Frequently Asked Questions

Yes. The black streaks commonly seen on asphalt shingles are usually roof algae. After a proper low pressure roof wash treatment, these stains will wash away. Then you are covered by our 2 Year No Black Streak Guarantee. If visible black streaks reappear within 2 years from your date of service, we will re-treat affected areas for free.

Not always. Moss and lichen are different from simple black streaking. Our treatment is designed to kill the organic growth safely, but the remaining dead material may stay attached to the shingles while it dries out and naturally releases over time. We follow ARMA (The Asphalt Roofing Manufacturer's Association) guidelines and rinse every slope after treatment. This removes MOST dead moss & lichen, but it's better to be cautious and let nature run it's course than to turn a soft wash into a pressure wash and potentially compromise your roofing system.Out of an abundance of caution, we choose not to equip our technicians with pressure washing machines.

Because aggressive removal can damage asphalt shingles. Moss and lichen can bond tightly to the protective granules on the shingle surface. Scraping, brushing too aggressively, or pressure washing may remove those granules and shorten the life of the roof. A safer approach is to treat the growth and let the roof release it naturally over time.

Yes. Moss and lichen can trap moisture against shingles and attach to the protective surface. Once the growth dies and releases, it may reveal granule loss, discoloration, or wear that was already present underneath. Cleaning kills algae, moss & lichen and prevents them from causing further damage to your home.

Light growth may release within a few weeks. Heavier moss or lichen can take several months. In severe cases, especially with thick lichen that has bonded tightly to the shingles, full release can take up to a year.

Yes. Our roof cleaning process follows the low pressure method recommended by the Asphalt Roofing Manufacturers Association (ARMA) for cleaning asphalt shingle roofs. We do not pressure wash shingles, because high pressure can remove granules and cause premature roof wear.